KR20200140067A - Electric compressor - Google Patents

Abstract

Disclosed is an electric compressor. According to an embodiment of the present invention, the electric compressor is formed such that a back pressure seal member for sealing a back pressure chamber can include a space part therein. The space part is formed to compensate for a shape deformation fraction made as the back pressure seal member is elastically deformed in accordance with the rotation of a rotary scroll. An elastic member can be provided in an upper part of the back pressure seal member. The elastic member can be provided as a plate shape such as a flat spring or the like. Accordingly, the elastic member can be stably placed on the back pressure seal member. As a result, even if the rotary scroll is rotated, damage to the elastic member can be minimized. An elastic body can be inserted into the space part of the back pressure seal member. The elastic body can be elastically deformed together with the back pressure seal member. Accordingly, when the rotary scroll is rotated or moved in an axial direction, the sealing condition of the back pressure chamber and the combination condition of the rotary scroll and the fixing scroll can be stably maintained.

Description

Electric compressor {Electric compressor}

The present invention relates to an electric compressor, and more specifically, an electric type of a structure capable of stably maintaining a sealed state of a back pressure chamber formed between an orbiting scroll and a frame part, and stably maintaining a combined state of the orbiting scroll and the fixed scroll. It relates to the compressor.

Compressors that compress refrigerants in vehicle air conditioning systems have been developed in various forms. In recent years, according to the trend of electrification of automobile parts, the development of electric compressors driven by electricity using a motor has been actively made.

A scroll compression method suitable for high-compression ratio operation is mainly applied to an electric compressor. Such a scroll type electric compressor (hereinafter referred to as "electric compressor") is composed of an electric unit, a compression unit, and a rotating shaft connecting the electric unit and the compression unit.

Specifically, the electric unit is provided with a rotary motor or the like and installed inside a sealed casing. The compression unit is located on one side of the electric unit, and consists of a fixed scroll and an orbiting scroll. The rotation shaft is configured to transmit the rotational force of the electric unit to the compression unit.

The orbiting scroll is supported by a frame to enable orbital movement. A back pressure chamber is formed between the frame and the orbiting scroll. The back pressure chamber is configured to offset the pressure generated between the fixed scroll and the orbiting scroll as the refrigerant is compressed. That is, when the refrigerant is compressed, the orbiting scroll receives pressure in a direction away from the fixed scroll.

The back pressure chamber is configured to prevent the orbiting scroll from being separated from the fixed scroll by applying pressure in a direction toward the fixed scroll to the orbiting scroll.

The back pressure chamber communicates with the space between the orbiting scroll and the fixed scroll. The refrigerant flows into the back pressure chamber through the above structure. The back pressure chamber must be sealed to prevent any leakage of the introduced refrigerant.

Referring to FIG. 1, a structure of a orbiting scroll 1000 provided in an electric compressor according to the prior art is shown. In the illustrated embodiment, a frame is positioned under the orbiting scroll 1000, and a back pressure chamber is formed therebetween.

A back pressure seal insertion portion 1100 is formed in a portion adjacent to the outer periphery of the orbiting scroll 1000. A back pressure seal 1200 and an upper O-ring 1300 are inserted into the back pressure seal insertion part 1100.

The back pressure seal 1200 is located adjacent to the frame. The back pressure seal 1200 is configured to seal the back pressure seal insertion portion 1100. An upper O-ring 1300 is provided on the upper side of the back pressure seal 1200 to allow a predetermined elasticity between the orbiting scroll 1000 and the frame.

When the orbiting scroll 1000 starts the orbiting motion, the back pressure seal 1200 and the upper O-ring 1300 receive a centrifugal force radially outward. Accordingly, the back pressure seal 1200 and the upper O-ring 1300 are in close contact with the inner wall 1110 radially outside of the back pressure seal insertion portion 1100.

In addition, as the refrigerant is compressed, the back pressure seal 1200 and the upper O-ring 1300 are continuously exposed to high temperature and high pressure conditions.

Accordingly, the back pressure seal 1200 and the upper O-ring 1300 are damaged by centrifugal force and the continuation of a high temperature and high pressure state. Accordingly, since the back pressure chamber is not completely sealed, random leakage of the refrigerant may occur. When the refrigerant flows out randomly, the pressure in the direction in which the orbiting scroll is separated from the fixed scroll is difficult to cancel.

As a result, there is a fear that the refrigerant may flow out arbitrarily and the compression efficiency of the refrigerant may decrease.

Korean Patent Document No. 10-0912515 discloses a scroll compressor having a back pressure seal sealing structure. Specifically, a scroll compressor having a structure capable of sealing a back pressure chamber by providing a ring-shaped guide plate around a rear surface of the orbiting scroll is disclosed.

However, the scroll compressor having such a structure has a limitation in that there is no consideration of a method for preventing damage to the guide plate for sealing the back pressure chamber.

Korean Patent Document No. 10-0780382 discloses a scroll compressor with improved oil circulation and back pressure control functions. Specifically, a scroll compressor having a structure capable of sealing a back pressure chamber by elastic deformation of the thrust plate by providing an elastic thrust plate on the rear side of the orbiting scroll is disclosed.

However, there is a limitation in that there is no consideration of a method for preventing damage to the thrust plate for sealing the back pressure chamber in the scroll compressor of this structure.

Furthermore, the above-described prior documents have a common limitation that there is no consideration of a method for applying an axial force to the orbiting scroll in order to prevent the orbiting scroll from being separated from the fixed scroll.

Korean Patent Document No. 10-0912515 (2009.08.19.) Korean Patent Document No. 10-0780382 (2007.11.29.)

An object of the present invention is to provide an electric compressor having a structure capable of solving the above-described problems.

First, it is an object to provide an electric compressor having a structure capable of preventing damage to a member for sealing a back pressure chamber.

In addition, an object of the present invention is to provide an electric compressor having a structure capable of reducing frictional force that may be generated between the orbiting scroll and the frame when the orbiting scroll is orbiting.

Another object of the present invention is to provide an electric compressor having a structure capable of preventing damage to a member that elastically supports the orbiting scroll in the axial direction.

In addition, an object of the present invention is to provide an electric compressor having a structure in which the orbiting scroll is movable in the axial direction.

In addition, it is an object of the present invention to provide an electric compressor having a structure capable of forming a sufficient back pressure in a back pressure chamber during initial driving.

In addition, an object of the present invention is to provide an electric compressor having a structure capable of maintaining the sealing of the back pressure chamber and the combined state of the orbiting scroll and the fixed scroll without significantly changing the internal structure.

In addition, it is an object of the present invention to provide an electric compressor having a structure in which operation reliability and compression efficiency can be improved.

In order to achieve the above object, the present invention, a fixed scroll; A orbiting scroll positioned adjacent to the fixed scroll and configured to compress a refrigerant by orbiting with respect to the fixed scroll; And a frame portion to which the orbiting scroll is pivotably coupled, wherein the orbiting scroll and the frame portion are coupled to form a predetermined space therebetween, and a back pressure seal configured to seal the predetermined space to the orbiting scroll. A (seal) member is inserted and coupled, and an elastic member is provided on one side of the back pressure seal member facing the fixed scroll, providing an electric compressor configured to compensate for movement of the back pressure seal member in a direction toward the fixed scroll. do.

In addition, a back pressure seal inserting portion configured to be recessed by a predetermined distance and configured to insert the back pressure seal member may be disposed on a surface of one side of the orbiting scroll facing the frame portion of the electric compressor.

In addition, the back pressure seal member of the electric compressor, the body portion extending in the longitudinal direction; A neck portion extending at a predetermined angle with the body portion at one end of the body portion facing the fixed scroll and having a thickness smaller than that of the body portion; And a head portion extending from an end portion of the neck portion to form a predetermined angle with the neck portion, and having the elastic member positioned adjacent to one side facing the fixed scroll.

In addition, the back pressure seal member of the electric compressor may include a space portion surrounded by the body portion, the neck portion, and the head portion.

In addition, an elastic body may be provided in the space portion of the electric compressor, and may be configured to compensate for movement of the body portion and the neck portion in a direction toward the fixed scroll and a direction away from the fixed scroll.

In addition, the present invention, fixed scroll; A orbiting scroll positioned adjacent to the fixed scroll and configured to compress a refrigerant by orbiting with respect to the fixed scroll; And a frame portion to which the orbiting scroll is pivotably coupled, wherein the orbiting scroll and the frame portion are coupled to form a predetermined space therebetween, and a back pressure seal configured to seal the predetermined space to the orbiting scroll. Provides an electric compressor configured to compensate for movement of the back pressure seal member in a direction toward the fixed scroll and a direction away from the fixed scroll by inserting and coupling a (seal) member into the back pressure seal member. .

In addition, an elastic body may be provided in the space portion of the electric compressor, and may be configured to compensate for movement of the back pressure seal member in a direction toward the fixed scroll and a direction away from the fixed scroll.

In addition, the back pressure seal member of the electric compressor, the body portion extending in the longitudinal direction; A neck portion extending at a predetermined angle with the body portion at one end of the body portion facing the fixed scroll and having a thickness smaller than that of the body portion; And a head portion extending from an end portion of the neck portion to the neck portion at a predetermined angle, and the space portion may be formed surrounded by the body portion, the neck portion, and the head portion.

In addition, the present invention, fixed scroll; A orbiting scroll positioned adjacent to the fixed scroll and configured to compress a refrigerant by orbiting with respect to the fixed scroll; And a frame portion to which the orbiting scroll is pivotably coupled, wherein the orbiting scroll and the frame portion are coupled to form a predetermined space therebetween, and a back pressure seal configured to seal the predetermined space to the orbiting scroll. The (seal) member is inserted and coupled, the back pressure seal member, the body portion extending in the longitudinal direction; And an inclined portion extending at a predetermined angle with the body portion at one end of the body portion facing the fixed scroll and having a thickness smaller than that of the body portion.

In addition, the back pressure seal member of the electric compressor may include an inner space portion surrounded by the body portion and the inclined portion.

According to the present invention, the following effects can be achieved.

First, in one embodiment, only the back pressure seal is inserted into the back pressure seal insertion part. The back pressure seal includes a space therein and is configured to be capable of changing a predetermined shape.

Therefore, when the electric compressor is driven, even if the back pressure seal is subjected to centrifugal force, the back pressure seal itself may be elastically deformed to some extent. Accordingly, damage to the back pressure seal by centrifugal force can be prevented.

In addition, when the orbiting scroll rotates, only the back pressure seal is in close contact with the back pressure seal insertion portion in a radially outward direction by the centrifugal force.

Accordingly, as the orbiting scroll rotates, the frictional force generated between the back pressure seal and the elastic member may be reduced.

In addition, in the above-described embodiment, the elastic member is not separately provided. Thus, damage to the elastic member can be prevented.

In addition, in an embodiment in which the elastic member is provided, the elastic member is insertedly coupled to the space formed inside the back pressure seal. An opening is formed in a direction radially inward of the orbiting scroll of the space. Conversely, a neck portion is formed in the radially outward direction of the orbiting scroll of the space portion.

Accordingly, friction caused by the elastic member coming into contact with the inner wall of the back pressure seal insertion portion and thus damage to the elastic member can be prevented.

In addition, in an embodiment in which the elastic member is provided, the elastic member is provided in the form of a leaf spring. The leaf spring is located above the back pressure seal and is configured to elastically support the back pressure seal.

Therefore, compared to the case where the elastic member is provided as an O-ring, damage to the elastic member can be reduced.

Further, the orbiting scroll is configured to be elastically supported by the back pressure seal itself, an elastic body or an elastic member.

Thus, since the orbiting scroll receives an elastic force in the axial direction, it can be moved in the axial direction.

In addition, even at the beginning of the refrigerant compression process, the orbiting scroll is not separated from the fixed scroll due to the above configurations. In addition, the back pressure chamber can be sufficiently sealed by the back pressure seal.

Accordingly, the back pressure chamber is stably sealed even at the beginning of the compression process of the refrigerant, so that sufficient back pressure can be formed.

In addition, it is possible to seal the back pressure chamber only by changing the shape of the back pressure seal itself or changing the shape of the provided elastic body or elastic member.

Accordingly, it is possible to maintain the sealing of the back pressure chamber and the coupled state of the orbiting scroll and the fixed scroll without significantly changing the internal structure of the electric compressor.

In addition, since a sufficient back pressure is formed in the back pressure chamber from the beginning of the compression process of the refrigerant, the compression process of the refrigerant can be efficiently performed. Accordingly, operation reliability and compression efficiency of the electric compressor can be improved.

1 is a cross-sectional view showing the structure of a orbiting scroll of an electric compressor according to the prior art.
2 is a perspective view of an electric compressor according to an embodiment of the present invention.
3 is an exploded perspective view of the electric compressor of FIG. 2.
4 is a cross-sectional view of the electric compressor of FIG. 2.
5 is a cross-sectional view showing a sealing member provided in the electric compressor according to an embodiment of the present invention.
6 is a cross-sectional view showing a sealing member provided in an electric compressor according to another embodiment of the present invention.
7 is a cross-sectional view showing a sealing member provided in an electric compressor according to another embodiment of the present invention.
8 is a cross-sectional view showing a sealing member provided in an electric compressor according to another embodiment of the present invention.
7 is a cross-sectional view of the electric compressor including the magnetic portion of FIG. 5.
8 is a cross-sectional view of an electric compressor including the orbiting scroll of FIG. 6.

Hereinafter, an electric compressor according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In the following description, descriptions of some constituent elements may be omitted to clarify features of the present invention.

1. Definition of terms

When a component is referred to as being "connected" or "connected" to another component, it is understood that it may be directly connected or connected to the other component, but other components may exist in the middle. Should be.

On the other hand, when a component is referred to as being "directly connected" or "directly connected" to another component, it should be understood that there is no other component in the middle.

The singular expression used in the present specification includes a plural expression unless the context clearly indicates otherwise.

The term "refrigerant" used in the following description refers to any medium that takes heat from a low-temperature object and transports it to a high-temperature object. In one embodiment, the refrigerant may be carbon dioxide (CO ₂ ), R134a, R1234yf, or R744.

In the following description, it is assumed that the electric compressor 10 according to an embodiment of the present invention uses R744 as a refrigerant, but other refrigerants described above may also be used in the electric compressor 10 according to an embodiment of the present invention.

The terms "front side", "rear side", "upper side", "lower side", "right side" and "left side" used in the following description will be understood with reference to the coordinate system shown in FIG. 2.

2. Description of the configuration of the electric compressor 10 according to the embodiment of the present invention

2 to 4, the electric compressor 10 according to an embodiment of the present invention includes a main housing 100, a rear housing 200, an inverter unit 300, a motor unit 400, and a rotating shaft unit 500. ), a frame portion 600 and a compression portion 700.

In addition, the electric compressor 10 according to the embodiment of the present invention seals the back pressure chamber S2 formed between the frame part 600 and the compression part 700, and induces a smooth rotational motion of the compression part 700. It includes a back pressure seal portion 800 for.

Hereinafter, each configuration of the electric compressor 10 according to an embodiment of the present invention will be described with reference to FIGS. 2 to 4, but the back pressure seal unit 800 will be described as a separate paragraph.

(1) Description of the main housing 100

The main housing 100 forms a part of the exterior of the electric compressor 10. In addition, the main housing 100 forms the body of the electric compressor 10 and accommodates various components for compressing the refrigerant therein. For example, the motor part 400, the rotation shaft part 500, the frame part 600, and the compression part 700 may be accommodated in the main housing 100.

The main housing 100 has a circular cross section and has a cylindrical shape extending in the longitudinal direction and in the front-rear direction in the illustrated embodiment. The shape of the main housing 100 can be changed to an arbitrary shape that can accommodate the motor unit 400, the rotation shaft unit 500, the frame unit 600, and the compression unit 700 therein.

However, considering that high pressure is generated in the main housing 100 as the refrigerant is compressed, the main housing 100 preferably has a circular cross section with high pressure resistance.

A rear housing 200 is provided on one side of the main housing 100 and a front side in the illustrated embodiment. The main housing 100 communicates with the rear housing 200. The refrigerant compressed by the compression unit 700 accommodated in the main housing 100 may flow to the rear housing 200 and be discharged to the outside of the electric compressor 10.

An inverter unit 300 is provided on the other side of the main housing 100 facing the rear housing 200 and on the rear side in the illustrated embodiment. The inverter unit 300 is configured to apply power and control signals to a device accommodated in the main housing 100. The inverter unit 300 is electrically connected to a device accommodated in the main housing 100.

In one embodiment, the main housing 100 and the inverter unit 300 may communicate with each other. As the electric compressor 10 is operated, a lot of heat is generated in the printed circuit board 340 and the inverter device 350 accommodated in the inverter unit 300.

In an embodiment in which the main housing 100 and the inverter unit 300 communicate with each other, the refrigerant introduced into the main housing 100 flows into the inverter chamber S1 inside the inverter unit 300, and the printed circuit board 340 ) And the inverter device 350 may be directly cooled.

The main housing 100 includes a motor chamber 110 and an intake port 120.

The motor chamber 110 is a space in which the motor unit 400 is accommodated. The motor chamber 110 may be defined as an inner space of the main housing 100. The motor unit 400 accommodated in the motor chamber 110 is configured such that the outer circumferential surface contacts the outer circumferential surface of the motor chamber 110. That is, the outer circumferential surface of the motor part 400 is in contact with the inner circumferential surface of the main housing 100.

The motor chamber 110 is in communication with the intake port 120 and the compression unit 700. The refrigerant introduced into the main housing 100 may pass through the motor chamber 110 and flow into the compression unit 700.

In an embodiment not shown, the motor chamber 110 may be provided as a separate housing (not shown). In the above embodiment, a separate housing (not shown) forming the motor chamber 110 may be accommodated in the main housing 100. In this case, the outer peripheral surface of the separate housing (not shown) may be configured to contact the inner peripheral surface of the main housing 100.

In an embodiment not shown, a protrusion (not shown) may be formed on the outer circumferential surface of the motor chamber 110 and a groove (not shown) may be recessed on the outer circumferential surface of the stator 410. In the above embodiment, the motor unit 400 may be accommodated in the motor chamber 110 only in a direction in which the protrusion (not shown) is inserted into the groove (not shown 0).

The intake port 120 communicates the inside and the outside of the main housing 100. The refrigerant may flow into the main housing 100 through the intake port 120.

The intake port 120 may be formed in any shape capable of communicating the inside and the outside of the main housing 100. In one embodiment, the intake port 120 may be formed as a through hole penetrating the outer circumference of the main housing 100.

In the illustrated embodiment, the intake port 120 is located on the rear side of the outer circumferential surface of the main housing 100, that is, adjacent to the inverter unit 300. This is for the refrigerant introduced through the intake port 120 to heat exchange with the inverter unit 300 to cool the printed circuit board 340 and the inverter device 350 accommodated in the inverter chamber S1.

The refrigerant introduced through the intake port 120 is compressed in the compression unit 700 and then discharged through the exhaust port 212 of the rear housing 200.

(2) Description of the rear housing 200

The rear housing 200 forms a part of the exterior of the electric compressor 10. In addition, the rear housing 200 includes a flow path through which refrigerant and oil can flow, and includes an exhaust port 212 through which the refrigerant is discharged to the outside.

The rear housing 200 is located on one side of the main housing 100 and on the front side in the illustrated embodiment. The rear housing 200 and the main housing 100 are configured to communicate with each other. The refrigerant compressed by the compression unit 700 inside the main housing 100 may flow into the rear housing 200.

The rear housing 200 is provided in the shape of a cap having a circular cross section. The rear housing 200 may be coupled to the main housing 100 to seal the main housing 100.

The rear housing 200 and the main housing 100 are coupled to form a predetermined space therebetween. The predetermined space may be defined as the discharge chamber S3. The refrigerant compressed in the compression unit 700 passes through the discharge chamber S3 before flowing into the rear housing 200 and may drop to a required pressure.

The rear housing 200 includes an exhaust flow path 210 and an oil flow path 220.

The exhaust passage 210 is a passage through which the refrigerant compressed by the compression unit 700 is discharged to the outside. In the illustrated embodiment, the exhaust passage 210 is formed in the rear housing 200 in a vertical direction. This is due to the tendency of the compressed refrigerant to move upward due to the difference in density.

An oil separation device (not shown) may be provided on the exhaust passage 210. The oil separation device (not shown) is configured to separate oil mixed with the compressed refrigerant. In an embodiment, the oil separation device (not shown) may be configured to separate oil by a centrifugal separation method.

An exhaust port 212 is formed at one end of the exhaust passage 210 and an upper end of the exhaust passage 210 in the illustrated embodiment. The exhaust port 212 communicates the inside and the outside of the rear housing 200. The refrigerant may be discharged to the outside of the rear housing 200 through the exhaust port 212.

The exhaust port 212 may be formed in an arbitrary shape capable of communicating the inside and the outside of the rear housing 200. In one embodiment, the exhaust port 212 may be formed as a through hole penetrating the outer circumference of the rear housing 200.

The refrigerant discharged from the exhaust port 212 selectively passes through an oil separator (not shown) and then flows into a condenser (not shown) to undergo a condensation process.

The oil passage 220 is a passage through which oil separated from the compressed refrigerant flows. In the illustrated embodiment, the oil passage 220 is formed in the rear housing 200 in a vertical direction. In addition, the oil passage 220 is located under the exhaust passage 210. This is due to the tendency of the separated oil to move downward due to the difference in density.

The oil passage 220 communicates with the exhaust passage 210. In addition, the oil passage 220 may be in communication with the rotating shaft part 500 and the compression part 700. The oil moved to the lower side of the rear housing 200 through the oil flow path 220 is discharged through an oil outlet (not shown).

In addition, it may be supplied to the rotary shaft portion 500 and the compression portion 700 by any means (not shown) for applying a conveying force to the oil.

(3) Description of the inverter unit 300

The inverter unit 300 applies power and control signals to a device accommodated in the main housing 100, in particular, the motor unit 400. The inverter unit 300 is electrically connected to a device accommodated in the main housing 100, in particular, the motor unit 400 by a conductive wire (not shown) or a connector unit (not shown).

The inverter unit 300 may receive power and control signals from an external controller (not shown). The inverter unit 300 is electrically connected to an external control unit (not shown).

Electrical devices for processing power and control signals applied from the outside, such as the printed circuit board 340 and the inverter device 350, and transmitting them to the motor unit 400 may be accommodated inside the inverter unit 300.

The inverter unit 300 is located on one side of the main housing 100 facing the rear housing 200 and on the rear side in the illustrated embodiment.

The inverter unit 300 may communicate with the main housing 100. The refrigerant introduced into the main housing 100 may be introduced into the inverter chamber S1 inside the inverter unit 300. The introduced refrigerant may directly cool the inverter device 350 or the like.

The inverter unit 300 includes an inverter housing 310, an inverter cover 320, a connector module 330, a printed circuit board 340, and an inverter device 350.

The inverter housing 310 forms a part of the outside of the inverter unit 300. The inverter housing 310 is located adjacent to the main housing 100. The inverter housing 310 is a portion where the inverter unit 300 is coupled to the main housing 100.

A connector module 330 is provided on one side of the inverter housing 310 and on the front side in the illustrated embodiment. In addition, a connector connection part (not shown) is formed on the one side of the inverter housing 310 to enable a connector unit (not shown) to be energized.

In one embodiment, the inverter housing 310 may communicate with the main housing 100. In the above embodiment, the refrigerant introduced into the main housing 100 may be introduced into the inverter chamber S1 so that the inverter device 350 may be cooled directly.

The inverter cover 320 is coupled to the other side of the inverter housing 310 facing the one side, and the rear side in the illustrated embodiment. The inverter housing 310 and the inverter cover 320 are combined to form a predetermined space therein.

The inverter room S1 may be defined by the predetermined space. In the inverter room S1, the printed circuit board 340 and the inverter device 350 are accommodated.

The inverter cover 320 forms the outside of the inverter unit 300 together with the inverter housing 310. The inverter cover 320 is coupled to the inverter housing 310 to form a predetermined space therein. The predetermined space is defined as the inverter room S1.

The inverter cover 320 is located on one side of the inverter housing 310 facing the main housing 100, and on the rear side in the illustrated embodiment. The inverter cover 320 may be coupled to the inverter housing 310 by a separate fastening means (not shown).

The connector module 330 is a part in which the inverter unit 300 is electrically connected to an external control unit (not shown). A connector (not shown) is connected to the connector module 330 so as to be energized, so that power and control signals applied from an external control unit (not shown) may be transmitted to the inverter unit 300.

Power and control signals received from the connector module 330 are transferred to the motor unit 400. The motor unit 400 is driven according to the transmitted power and control signals, and generates a rotational force for rotating the compression unit 700.

In the illustrated embodiment, the connector module 330 is located on the front upper side of the inverter housing 310. The location of the connector module 330 may be determined as an arbitrary location capable of being electrically connected to an external control unit (not shown).

The connector module 330 includes a communication connector 332 for receiving a control signal and a power connector 334 for receiving a power signal. Alternatively, the connector module 330 may be provided as a single connector. The single connector may be configured to receive both power and control signals.

The printed circuit board 340 and the inverter device 350 generate a control signal for controlling the motor unit 400. The printed circuit board 340 and the inverter device 350 are configured to generate a control signal for controlling the motor unit 400 by using the control signal transmitted through the connector module 330.

The control signals and power signals generated by the printed circuit board 340 and the inverter device 350 are transmitted to the motor unit 400 by a conductor (not shown) or a connector unit (not shown).

(4) Description of the motor unit 400

The motor unit 400 is operated according to power and control signals applied from the inverter unit 300. The motor unit 400 is rotated according to the power and control signals. The rotation of the motor unit 400 is transmitted to the compression unit 700, and acts as a power for compressing the refrigerant.

The motor unit 400 is connected to the inverter unit 300 to be energized. To this end, a conducting member (not shown) or a connector unit (not shown) may be provided.

The motor unit 400 is accommodated in the main housing 100. Specifically, the motor unit 400 is accommodated in the motor chamber 110, and is accommodated so that the outer peripheral surface of the motor unit 400 contacts the outer peripheral surface of the motor chamber 110, that is, the inner peripheral surface of the main housing 100.

The motor unit 400 is connected to the rotation shaft unit 500. Specifically, the rotation shaft part 500 is coupled through the motor part 400. When the rotor 420 of the motor unit 400 is rotated, the rotation shaft unit 500 is rotated integrally with the rotor 420. Accordingly, the compression unit 700 connected to the rotary shaft unit 500 may be rotated to compress the refrigerant.

The motor unit 400 includes a stator 410 and a rotor 420.

The stator 410 forms the outside of the motor unit 400. The stator 410 has a circular cross section and has a cylindrical shape extending in the longitudinal direction and in the front-rear direction in the illustrated embodiment.

Inside the stator 410, a hollow portion penetrating in the longitudinal direction is formed. The rotor 420 is rotatably accommodated in the hollow part. The rotor 420 is accommodated to be spaced apart from the stator 410 by a predetermined distance. That is, the outer circumferential surface of the rotor 420 and the inner circumferential surface of the stator 410, that is, the outer circumferential surface of the hollow portion do not contact.

The outer circumferential surface of the stator 410 is in contact with the outer circumferential surface of the motor chamber 110, that is, the inner circumferential surface of the main housing 100. The stator 410 may be fixed to the motor chamber 110. Accordingly, even if the rotor 420 is rotated, the stator 410 may not be rotated.

The stator 410 is connected to the inverter unit 300 to be energized.

The stator 410 includes a plurality of coils (not shown). A coil (not shown) is wound around the stator 410. In one embodiment, the coil (not shown) may be wound on both sides of the stator 410 in the longitudinal direction, that is, the front and rear ends.

The coil (not shown) is connected to the inverter unit 300 to be energized. Power and control signals applied from the inverter unit 300 are transmitted to a coil (not shown).

The coil (not shown) forms an electromagnetic field by receiving power and control signals. An electromagnetic field formed by a coil (not shown) exerts an electromagnetic force on a magnet provided in the rotor 420. The magnet and the rotor 420 provided with the magnet are rotated clockwise or counterclockwise by the electromagnetic force.

The rotor 420 is rotatably accommodated in a hollow portion formed inside the stator 410. The rotor 420 is accommodated to be spaced apart from the stator 410 by a predetermined distance. That is, the outer peripheral surface of the rotor 420 and the inner peripheral surface of the stator 410 do not contact each other.

Thus, the rotor 420 may rotate relative to the stator 410.

The rotor 420 includes a plurality of magnets. When power and control signals are applied from the inverter unit 300, a plurality of coils (not shown) wound around the stator 410 form an electromagnetic field. The magnet of the rotor 420 receives electromagnetic force by the electromagnetic field, and the rotor 420 is rotated in a clockwise or counterclockwise direction.

The rotating shaft part 500 is coupled through the rotor 420. When the rotor 420 is rotated, the rotation shaft part 500 is also configured to rotate integrally with the rotor 420.

(5) Description of the rotating shaft part 500

The rotation shaft part 500 transmits the rotational force generated as the motor part 400 is driven to the compression part 700. The compression unit 700 is rotated by the rotation of the rotary shaft unit 500 to compress the refrigerant.

The rotation shaft part 500 is coupled to the rotor 420. Specifically, the rotation shaft part 500 is coupled to the rotor 420 so as to rotate integrally with the rotor 420.

The rotation shaft part 500 is formed to extend in the longitudinal direction and in the front-rear direction in the illustrated embodiment. One side of the rotating shaft part 500 facing the inverter part 300 is supported by the inverter housing 310. In addition, one side of the rotation shaft 500 facing the compression unit 700 is connected to the orbiting scroll 710 of the compression unit 700.

The rotation shaft part 500 is rotatably coupled through the main bearing 630 of the frame part 600. In other words, the rotation shaft part 500 is rotatably supported by the main bearing 630.

The rotation shaft part 500 includes a first end 510, a second end 520, an eccentric part 530, and a rotation pin member 540. The rotation pin member 540 is shown in FIGS. 5 and 6.

The first end 510 may be defined as one end of the rotating shaft part 500 adjacent to the inverter part 300. The first end 510 is rotatably coupled to the inverter housing 310.

A first bearing 512 is provided in the inverter housing 310 to which the first end 510 is coupled. The first bearing 512 rotatably supports the first end 510 so that the inverter housing 310 is not rotated even if the rotating shaft part 500 is rotated.

The second end 520 may be defined as one end of the rotating shaft part 500 adjacent to the compression part 700. The second end 520 is coupled to the orbiting scroll 710. When the second end 520, that is, the rotation shaft part 500 is rotated, the orbiting scroll 710 may also be rotated.

A second bearing 522 is provided at a portion of the orbiting scroll 710 to which the second end 520 is coupled. The second bearing 522 is insertedly coupled to the second bearing coupling portion 714 formed on the orbiting scroll 710. The second bearing 522 is configured so that when the rotating shaft part 500 is rotated, the orbiting scroll 710 is not rotated and can rotate.

Specifically, an eccentric portion 530 configured to rotate the orbiting scroll 710 is rotatably coupled to the second bearing 522. The eccentric part 530 is coupled eccentrically with the rotation shaft part 500 and rotates integrally with the rotation shaft part 500.

Accordingly, when the rotation shaft part 500 is rotated, the eccentric part 530 is rotated by being eccentric with respect to the rotation shaft part 500. Accordingly, the orbiting scroll 710 connected to the eccentric portion 530 is rotated according to the rotation of the eccentric portion 530. At this time, the rotation of the eccentric portion 530 is not transmitted to the orbiting scroll 710 by the second bearing 522.

The eccentric part 530 is coupled to the second end 520 of the rotation shaft part 500 so as to be eccentric with respect to the rotation shaft part 500. When the rotation shaft part 500 is rotated, the eccentric part 530 may also be eccentrically rotated.

In addition, the eccentric portion 530 is rotatably coupled to the orbiting scroll 710 by a rotation pin member 540. A second bearing 522 is provided at a coupling portion between the eccentric portion 530 and the orbiting scroll 710. Accordingly, by the eccentric rotation of the eccentric portion 530, the orbiting scroll 710 may be rotated without rotating.

The rotation pin member 540 is coupled to the eccentric portion 530 and the second bearing 522, respectively. One side of the rotation pin member 540 facing the eccentric portion 530 is coupled with the eccentric portion 530 so as to rotate together with the eccentric portion 530. One side of the rotation pin member 540 facing the second bearing 522 is rotatably supported by the second bearing 522.

The rotation pin member 540 may be disposed to have a different central axis from the rotation shaft part 500. That is, the rotation pin member 540 is disposed to be eccentric with respect to the rotation shaft part 500. Accordingly, when the rotation shaft part 500 is rotated, the rotation pin member 540 and the eccentric part 530 connected to the rotation pin member 540 may be eccentrically rotated with respect to the rotation shaft part 500. Furthermore, the orbiting motion of the orbiting scroll 710 can also be achieved by the arrangement.

(6) Description of the frame part 600

The frame part 600 supports the orbiting scroll 710 to enable orbital movement. Further, the frame part 600 is coupled to the fixed scroll 720 so that the fixed scroll 720 can stably maintain a fixed state.

The frame part 600 rotatably supports the rotation shaft part 500. The rotation shaft part 500 is rotatably coupled through the frame part 600. Even if the rotation shaft part 500 is rotated, the frame part 600 is not rotated. To this end, the main bearing 630 is pressed into the frame part 600.

The frame part 600 is in contact with the orbiting scroll 710 to form a predetermined space. The back pressure chamber S2 may be defined by the space.

The frame part 600 is coupled to the orbiting scroll 710 so that the orbiting scroll 710 is orbitally moved, but does not rotate. This is achieved by the pin member 640 and the ring member 650.

The frame part 600 is located between the motor part 400 and the orbiting scroll 710. The frame part 600 has a circular cross section. The diameter of one side of the frame part 600 toward the orbiting scroll 710 may be larger than the diameter of the other side toward the motor part 400.

An orbiting scroll 710 is coupled to the one side of the frame part 600 to enable orbital movement. In addition, an outer peripheral portion of the fixed scroll 720 is fixedly coupled to the one side.

The frame part 600 includes a frame body part 610, a main bearing seating part 620, a main bearing 630, a pin member 640, and a ring member 650.

The frame body portion 610 forms the body of the frame portion 600. The frame body portion 610 may be divided into one side portion facing the orbiting scroll 710 and the other side portion facing the motor unit 400.

An orbiting scroll 710 is rotatably coupled to the one side portion. The one side portion may be combined with the orbiting scroll 710 to form a predetermined space. The space may be defined as a back pressure chamber S2.

An insertion hole into which the pin member 640 is inserted is formed radially outside the space. A plurality of insertion holes may be formed radially outside the space and spaced apart from each other by a predetermined distance in the circumferential direction.

A fixed scroll 720 is fixedly coupled to the outer circumferential portion of the one portion. In addition, the outer circumferential portion of the one side portion may be fixedly coupled to the inner circumferential surface of the main housing 100.

The other part is located spaced apart from the motor part 400 by a predetermined distance.

A hollow portion is formed through the frame body 610 in the axial direction, in the front-rear direction in the illustrated embodiment. A rotation shaft part 500 is coupled through the hollow part. In this case, the rotation shaft part 500 may be rotatably coupled by the main bearing 630. The hollow part may be formed to have the same central axis as the rotation shaft part 500.

A main bearing seating part 620 is formed inside the frame body part 610 facing the motor part 400.

The main bearing seating part 620 is a part into which the main bearing 630 is pressed. The main bearing seating portion 620 may be formed to extend radially inside the hollow portion through which the rotation shaft portion 500 is coupled. That is, the main bearing seating portion 620 is a space formed inside the other side of the frame body portion 610 and having a larger diameter than the hollow portion.

The main bearing seating part 620 may be formed to have the same central axis as the rotation shaft part 500.

The main bearing 630 is coupled through the rotation shaft 500. The main bearing 630 rotatably supports the rotating shaft part 500. Even if the rotation shaft part 500 is rotated, the frame body part 610 is not rotated by the main bearing 630.

The main bearing 630 may be provided in an arbitrary shape capable of connecting two or more different members so that rotation of one member does not affect other members. In one embodiment, the main bearing 630 may be provided as a ball bearing.

The pin member 640 and the ring member 650 couple the orbiting scroll 710 to the frame part 600 so as to be capable of orbiting.

The pin member 640 is formed to extend in the longitudinal direction. One side of the pin member 640 is inserted into an insertion hole of the frame body portion 610. The other side of the pin member 640 is inserted into the ring member coupling portion 715 of the orbiting scroll 710.

At this time, the insertion hole is formed so that the pin member 640 is fixedly coupled. That is, the pin member 640 inserted into the insertion hole does not move inside the insertion hole.

On the other hand, the ring member coupling portion 715 is formed in a larger space than the pin member 640. Accordingly, the pin member 640 may be moved inside the ring member coupling portion 715.

The ring member 650 limits movement of the pin member 640 inserted into the ring member coupling portion 715. Specifically, the ring member 650 is insertedly coupled to the ring member coupling portion 715. When the ring member 650 is inserted and coupled, the inner circumferential surface surrounding the ring member coupling portion 715 is covered by the ring member 650.

As described above, the pin member 640 may be moved inside the ring member coupling portion 715. At this time, by the ring member 650, the pin member 640 may not directly contact the inner circumferential surface surrounding the ring member coupling portion 715, but may contact the ring member 750.

Accordingly, the inner circumferential surface surrounding the pin member 640 and the ring member coupling portion 715 is not damaged by friction.

(7) Description of the compression unit 700

The compression unit 700 compresses the refrigerant introduced into the main housing 100. The compression unit 700 is configured to compress the refrigerant by repeating the process of increasing or decreasing the space occupied by the introduced refrigerant.

The compression unit 700 is connected to the rotation shaft unit 500. Specifically, the orbiting scroll 710 is connected to the eccentric portion 530 by a rotation pin member 540. When the rotation shaft part 500 is rotated by the motor part 400, the eccentric part 530 is eccentrically rotated with respect to the rotation shaft part 500.

As the eccentric portion 530 rotates, the orbiting scroll 710 connected to the eccentric portion 530 rotates relative to the fixed scroll 720, that is, orbits.

The compression unit 700 is accommodated in the main housing 100. Specifically, the compression unit 700 is located on one side adjacent to the rear housing 200 within the main housing 100. The compression unit 700 may be located between the frame unit 600 and the rear housing 200.

In an embodiment not shown, the fixed scroll 720 of the compression unit 700 may not be accommodated in the main housing 100. In the above embodiment, the fixed scroll 720 may be located outside the main housing 100 and between the main housing 100 and the rear housing 200.

The compression unit 700 communicates with the inner space of the main housing 100. The refrigerant introduced into the main housing 100 may flow into the compression unit 700.

The compression unit 700 communicates with the inner space of the rear housing 200. The refrigerant compressed by the compression unit 700 may be discharged to the outside of the electric compressor 10 through the rear housing 200.

The compression unit 700 includes an orbiting scroll 710 and a fixed scroll 720.

The orbiting scroll 710 is rotated relative to the fixed scroll 720 by a rotational force generated as the motor unit 400 is driven. The refrigerant flowing into the space between the orbiting scroll 710 and the fixed scroll 720 may be compressed by the orbiting motion.

The orbiting scroll 710 is connected to the motor unit 400. Specifically, the rotation shaft part 500 connected to the motor part 400 is connected to the eccentric part 530, and the orbiting scroll 710 is connected to the eccentric part 530 by a rotation pin member 540.

When the motor unit 400 is driven, the rotation shaft unit 500 is rotated. The eccentric portion 530 is rotated by being eccentric with respect to the rotation shaft portion 500. At this time, the orbiting scroll 710 is eccentric with respect to the fixed scroll 720 by the eccentric rotation of the eccentric portion 530 and rotates.

One side of the orbiting scroll 710 facing the frame part 600 forms a predetermined space therebetween and may be in contact with the frame body part 610. The predetermined space may be defined as a back pressure chamber S2.

The refrigerant introduced into the back pressure chamber S2 is configured to apply a back pressure to the orbiting scroll 710. That is, the refrigerant flowing into the back pressure chamber S2 applies a pressure in a direction toward the fixed scroll 720 to the orbiting scroll 710.

As the refrigerant is compressed in the compression unit 700, the orbiting scroll 710 receives pressure in a direction opposite to the fixed scroll 720 by the pressure of the compressed refrigerant.

Accordingly, when the orbiting scroll 710 is spaced apart from the fixed scroll 720, the end surface of the orbiting wrap 712 and the end surface of the fixed plate part 721 and the fixed wrap 722 and the orbiting plate part 711 are Can be separated.

The refrigerant compressed in the orbiting scroll 710 and the fixed scroll 720 may leak through the gap generated accordingly. As a result, it becomes difficult to perform compression until the refrigerant reaches the desired pressure.

At this time, the compressed refrigerant accommodated in the back pressure chamber S2 applies pressure in a direction toward the fixed scroll 720 to the orbiting scroll 710. Since the back pressure chamber S2 communicates with the space formed between the orbiting wrap 712 and the fixed wrap 722, the refrigerant accommodated in the back pressure chamber S2 may have the same pressure as the compressed refrigerant.

Accordingly, a balance of pressure between the space between the turning wrap 712 and the fixed wrap 722 and the back pressure chamber S2 is achieved. Accordingly, the contact state between the orbiting scroll 710 and the fixed scroll 720 is maintained, so that the refrigerant is not leaked and can be effectively compressed.

The orbiting scroll 710 may be formed of a material having high rigidity but low density. In one embodiment, the orbiting scroll 710 may be formed of aluminum (Al).

The orbiting scroll 710 includes an orbiting plate portion 711, a orbiting wrap 712, a refrigerant opening 713, a second bearing engaging portion 714, a ring member engaging portion 715, and a back pressure seal insertion portion 716. Include.

The orbiting plate portion 711 forms the body of the orbiting scroll 710. The turning hard plate part 711 may be formed in a circular plate shape. One side of the turning hard plate part 711 is configured to face the frame part 600. The other side of the orbiting plate portion 711 facing the one side is configured to face the fixed scroll 720.

A turning wrap 712 protrudes from the other side of the turning hard plate portion 711. The orbiting wrap 712 is configured to form a predetermined space and engage with the fixed wrap 722 of the fixed scroll 720.

With the orbiting wrap 712 engaged with the stationary wrap 722, the orbiting scroll 710 may be pivoted relative to the stationary scroll 720. Accordingly, the volume of the space between the revolving wrap 712 and the fixed wrap 722 is repeatedly expanded and contracted, and the refrigerant introduced into the space may be compressed.

The orbiting wrap 712 may be formed in a spiral shape. The fixed wrap 722 is also formed in a spiral shape, so that the orbiting wrap 712 and the fixed wrap 722 can be engaged to form a predetermined space therebetween.

The refrigerant opening 713 is a passage through which a part of the refrigerant compressed in the space between the revolving wrap 712 and the fixed wrap 722 flows into the back pressure chamber S2. The refrigerant opening 713 is formed through the turning plate portion 711.

Part of the refrigerant compressed in the space formed between the revolving wrap 712 and the fixed wrap 722 may flow into the back pressure chamber S2 through the refrigerant opening 713.

The second bearing 522 is inserted into the second bearing coupling part 714. As described above, the rotation pin member 540 is rotatably coupled to the second bearing 522. Accordingly, when the eccentric portion 530 is rotated, the orbiting scroll 710 is rotated relative to the fixed scroll 720.

The second bearing coupling portion 714 is formed by being recessed by a predetermined distance from one side of the turning plate portion 711 facing the frame portion 600. That is, the second bearing coupling portion 714 is formed as a kind of groove. The shape and size of the second bearing coupling portion 714 may be determined corresponding to the shape and size of the second bearing 522.

The ring member 650 is inserted into the ring member coupling portion 715. The ring member 650 inserted into the ring member coupling portion 715 is configured to prevent rotation of the orbiting scroll 710 together with the pin member 640.

In the illustrated embodiment, the ring member coupling portion 715 is formed on one side of the frame body portion 610 facing the orbiting scroll 710.

A plurality of ring member coupling portions 715 may be provided. In one embodiment, a plurality of ring member coupling portions 715 may be formed to be recessed by a predetermined distance by being spaced apart by a predetermined distance in the circumferential direction radially inside the turning plate portion 711.

The shape of the ring member coupling part 715 may be changed according to the shape of the ring member 650 to be inserted.

The back pressure seal part 800 is inserted into the back pressure seal insertion part 716. The back pressure seal insertion part 716 is located on one side of the turning plate part 711 facing the frame part 600. Further, the back pressure seal insertion portion 716 is formed to be recessed by a predetermined distance from the turning plate portion 711 at a position spaced from the outer periphery of the turning plate portion 711 radially inward by a predetermined distance.

A detailed description of the back pressure seal portion 800 inserted into the back pressure seal insertion portion 716 will be described later.

5 to 8, the back pressure seal insertion part 716 includes a first inner circumferential surface 716a, a second inner circumferential surface 716b, and a third inner circumferential surface 716c.

The first inner circumferential surface 716a may be defined as one surface surrounding the back pressure seal insertion portion 716. The first inner circumferential surface 716a is located radially outside of the orbiting scroll 710. That is, the first inner circumferential surface 716a forms an outer circumferential surface of the back pressure seal insertion portion 716.

When the orbiting scroll 710 is rotated, the back pressure seal portion 800 inserted into the back pressure seal insertion portion 716 receives a centrifugal force. Accordingly, the back pressure seal part 800 may be in close contact with the first inner circumferential surface 716a.

The electric compressor 10 according to an embodiment of the present invention is configured to prevent damage caused by the back pressure seal part 800 in close contact with the first inner circumferential surface 716a. A detailed description of this will be described later.

The second inner circumferential surface 716b is formed to extend at a predetermined angle with the first inner circumferential surface 716a. In an embodiment, the second inner circumferential surface 716b may be formed to extend perpendicular to the first inner circumferential surface 716a.

The second inner circumferential surface 716b may be defined as a surface surrounding the back pressure seal insertion portion 716. The second inner circumferential surface 716b is one surface perpendicular to the axial direction of the orbiting scroll 710. An opening is formed on the side opposite to the axial direction of the second inner peripheral surface 716b. The back pressure seal part 800 may be inserted into the opening.

The third inner circumferential surface 716c is formed to extend and form a predetermined angle with the second inner circumferential surface 716b. In an embodiment, the third inner circumferential surface 716c may be formed to extend perpendicular to the second inner circumferential surface 716b.

The third inner peripheral surface 716c is configured to face the first inner peripheral surface 716a. In an embodiment, the third inner peripheral surface 716c and the first inner peripheral surface 716a may be disposed in parallel.

The third inner circumferential surface 716c may be defined as one surface surrounding the back pressure seal insertion portion 716c. The third inner peripheral surface 716c is located radially inside the orbiting scroll 710. That is, the third inner circumferential surface 716c forms an inner circumferential surface of the back pressure seal insertion portion 716.

The third inner peripheral surface 716c is configured to be spaced apart from the first inner peripheral surface 716a by a predetermined distance. In one embodiment, the predetermined distance may be equal to or greater than the thickness of the back pressure seal part 800.

The third inner peripheral surface 716c and the first inner peripheral surface 716a are configured to extend by a predetermined distance. In one embodiment, the predetermined distance may be formed to be equal to or greater than the extended length of the back pressure seal part 800.

The fixed scroll 720 is configured to compress the refrigerant according to the relative orbiting motion of the orbiting scroll 710. The fixed scroll 720 is not rotated irrespective of the rotation of the motor unit 400. The outer peripheral surface of the fixed scroll 720 may be fixed to the inner peripheral surface of the main housing 100.

The fixed scroll 720 communicates with the inside of the main housing 100. The refrigerant flowing into the main housing 100 may flow into the space between the orbiting scroll 710 and the fixed scroll 720 through the frame part 600.

The fixed scroll 720 may communicate with the back pressure chamber S2. Part of the refrigerant compressed in the space between the orbiting scroll 710 and the fixed scroll 720 may flow into the back pressure chamber S2.

The fixed scroll 720 may be in communication with the exhaust flow path 210. Part of the refrigerant compressed in the space between the orbiting scroll 710 and the fixed scroll 720 may be discharged to the exhaust port 212 through the exhaust flow path 210.

The fixed scroll 720 is coupled to the rear housing 200 to form a predetermined space. The predetermined space may be defined as the discharge chamber S3. The refrigerant compressed in the space between the orbiting scroll 710 and the fixed scroll 720 may enter the exhaust flow path 210 through the discharge chamber S3.

The fixed scroll 720 may have high rigidity and may be formed of a material capable of receiving attractive force by magnetic force. In one embodiment, the fixed scroll 720 may be formed of cast iron or the like.

The fixed scroll 720 includes a fixed plate part 721, a fixed wrap 722, a discharge valve 723 and a discharge port 724.

The fixed plate part 721 forms the body of the fixed scroll 720. The fixed plate portion 721 may be formed in a circular plate shape. One side of the fixed plate portion 721 is configured to face the rear housing 200. The other side of the fixed plate portion 721 facing the one side is configured to face the frame portion 600 and the orbiting scroll 710.

A fixing wrap 722 is protruded from the other side of the fixing plate part 721. The fixed wrap 722 is configured to form a predetermined space and engage with the orbiting wrap 712 of the orbiting scroll 710.

With the fixed wrap 722 engaged with the orbiting wrap 712, the orbiting scroll 710 is pivoted relative to the fixed scroll 720. Accordingly, the refrigerant introduced into the space between the fixed wrap 722 and the orbiting wrap 712 is compressed.

The fixed wrap 722 may be formed in a spiral shape like the orbiting wrap 712.

The discharge valve 723 is configured to open or close the discharge port 724. The discharge valve 723 is provided as a reed valve or the like, and is configured to allow or block the flow of the refrigerant in a direction from the discharge port 724 toward the exhaust flow path 210. The allowance and blocking may be determined based on the pressure of the refrigerant introduced into the discharge port 724.

The discharge port 724 is a passage through which the refrigerant compressed in the space between the orbiting scroll 710 and the fixed scroll 720 goes to the exhaust flow path 210. The discharge port 724 is configured to communicate the space and the discharge chamber S3 by a discharge valve 723.

When the discharge valve 723 is opened, the compressed refrigerant may enter the exhaust flow path 210 through the discharge chamber S3 through the discharge port 724. When the discharge valve 723 is closed, the compressed refrigerant stays in the discharge port 724.

3. Description of the back pressure seal part 800 provided in the electric compressor 10 according to the embodiment of the present invention

The electric compressor 10 according to an embodiment of the present invention includes a back pressure seal part 800. The back pressure seal part 800 seals the back pressure chamber S2. In addition, the back pressure seal unit 800 is configured to maintain the coupled state of the orbiting scroll 710 and the fixed scroll 720 by a member having a shape of itself or an elastic force additionally provided.

The back pressure seal unit 800 according to an embodiment of the present invention includes back pressure seal members 810, 820, 830, and 840 according to each embodiment. The back pressure seal part 800 may be formed of a material that can be deformed to some extent, for example, a material having elasticity.

When the orbiting scroll 710 is rotated, the back pressure seal part 800 is elastically deformed and may be biased toward the first inner circumferential surface 716a and the second inner circumferential surface 716b. Accordingly, the back pressure seal insertion portion 716 and the back pressure chamber S2 may be sealed.

Hereinafter, a back pressure seal part 800 according to an embodiment of the present invention will be described in detail with reference to FIGS. 5 to 8.

(1) Description of the back pressure seal member 810 according to the first embodiment

5, the back pressure seal member 810 according to the illustrated embodiment includes a first body portion 811, a first neck portion 812, a first head portion 813, a first space portion 814, and It includes a first elastic member 815.

The first body portion 811 forms the body of the back pressure seal member 810. The first body portion 811 is formed to extend in the longitudinal direction.

When the back pressure seal member 810 is inserted into the back pressure seal insertion portion 716, one side of the first body portion 811 facing the fixed scroll 720, and in the illustrated embodiment, the lower portion is exposed to the outside. The back pressure chamber S2 may be sealed by the exposed portion.

The first body portion 811 is formed to have a predetermined thickness. The thickness of the first body portion 811 may be equal to or smaller than the width of the back pressure seal insertion portion 716.

Preferably, the thickness of the first body portion 811 is preferably formed to be smaller than the width of the back pressure seal insertion portion 716. Accordingly, the shape of the back pressure seal member 810 is deformed to some extent as the orbiting scroll 710 rotates, so that the back pressure seal insertion portion 716 may be sealed.

When the orbiting scroll 710 rotates, one side of the first body portion 811 facing the first inner peripheral surface 716a may be in close contact with the first inner peripheral surface 716a by centrifugal force.

A first neck portion 812 and a first head portion 813 are positioned on one side of the first body portion 811 facing the fixed scroll 720 and an upper side in the illustrated embodiment.

The first neck portion 812 connects the first body portion 811 and the first head portion 813. The first neck portion 812 is formed to extend and form a predetermined angle with the first body portion 811. In one embodiment, the first neck portion 812 may be formed to extend parallel to the first body portion 811.

The first neck portion 812 is formed to have a predetermined thickness. The thickness of the first neck portion 812 may be smaller than the thickness of the first body portion 811. Accordingly, a predetermined space may be formed between the first body portion 811 and the first neck portion 812. The space may be defined as a first space part 814.

The first neck portion 812 may be configured to contact the first inner peripheral surface 716a.

One end of the first neck portion 812 facing the first body portion 811, the first head portion 813 is positioned on the upper side in the illustrated embodiment.

The first head portion 813 is formed to extend and form a predetermined angle with the first neck portion 812. In one embodiment, the first head portion 813 may be formed to extend perpendicular to the first neck portion 812.

The first head portion 813 may be formed parallel to the second inner peripheral surface 716b. Accordingly, the first head portion 813 may be in close contact with the second inner peripheral surface 716b.

The first head portion 813 may be formed to extend equal to the width of the back pressure seal insertion portion 716. That is, the extended length of the first head portion 813 may be formed equal to the separation distance between the first inner peripheral surface 716a and the third inner peripheral surface 716c.

Accordingly, the space between the first head portion 813 and the second inner peripheral surface 716b may be sealed.

The space surrounded by the first body portion 811, the first neck portion 812 and the first head portion 813 is defined as a first space portion 814. That is, the first space portion 814 is a space surrounded by the first body portion 811, the first neck portion 812, the first head portion 813, and the third inner peripheral surface 716c.

The first space 814 is configured to compensate for a shape deformation of the back pressure seal member 810 that is generated as the orbiting scroll 710 moves in the orbiting motion or axial direction. That is, any one or more shape deformations of the first body portion 811, the first neck portion 812, and the first head portion 813 may be accommodated in the first space portion 814 by centrifugal force or elastic force.

Accordingly, even if the shape of the back pressure seal member 810 is deformed by centrifugal force or elastic force, it may not be discharged to the outside of the back pressure seal insertion portion 716. In addition, damage to the back pressure seal member 810 and the back pressure seal insertion portion 716 may be prevented.

A first elastic member 815 is positioned above the first head portion 813. The first elastic member 815 is configured to allow axial movement of the orbiting scroll 710, that is, movement toward the fixed scroll 720 or away from the fixed scroll 720.

In this embodiment, a certain amount of elastic force may be secured by the back pressure seal member 810 itself. The first elastic member 815 additionally applies an elastic force to the back pressure seal member 810 and the orbiting scroll 710 into which the back pressure seal member 810 is inserted, so that the orbiting scroll 710 rotates and moves in the axial direction. This makes it possible to perform stably.

The first elastic member 815 may be provided in any shape capable of storing elastic force by deformation of the shape, then returning to its original shape, and applying the elastic force to other members. In one embodiment, the first elastic member 815 may be provided as a leaf spring.

In an embodiment in which the first elastic member 815 is provided as a leaf spring, the first elastic member 815 is configured to cover the first head portion 813. Therefore, even if the back pressure seal member 810 is moved in a direction toward the fixed scroll 720 (upward direction in the illustrated embodiment) and compressed, the first elastic member 815 may damage the first head part 813. Does not apply.

The first elastic member 815 may be positioned to be spaced apart from the second inner peripheral surface 716b by a predetermined distance. Accordingly, a sufficient distance for the orbiting scroll 710 to move toward the fixed scroll 720 may be secured.

(2) Description of the back pressure seal member 820 according to the second embodiment

6, the back pressure seal member 820 according to the illustrated embodiment includes a second body portion 821, a second neck portion 822, a second head portion 823, a second space portion 824, and It includes a second elastic body (825).

Compared with the back pressure seal member 810 according to the first exemplary embodiment described above, the back pressure seal member 820 according to the present exemplary embodiment includes a second elastic body 825 instead of the first elastic member 815. There is.

In addition, the second body portion 821, the second neck portion 822, the second head portion 823 and the second space portion 824 are the first body portion 811, the first neck portion 812, the first The head portion 813 and the first space portion 814 have the same material, structure, and function.

However, there is a difference in that the second head portion 823 is configured to contact the second inner peripheral surface 716b. This is because the configuration corresponding to the first elastic member 815 is not provided.

Therefore, in the following description, the second elastic body 825 which is the difference from the back pressure seal member 810 according to the first embodiment will be described.

The second elastic body 825 is configured to additionally apply an elastic force for stably performing the orbiting movement and the axial movement of the orbiting scroll 710 in addition to the elastic force of the back pressure seal member 820 itself.

The second elastic body 825 is configured to allow axial movement of the orbiting scroll 710, that is, movement toward the fixed scroll 720 or away from the fixed scroll 720.

The second elastic body 825 may be insertedly coupled to the second space 824. The second elastic body 825 inserted and coupled to the second space part 824 is surrounded by the second body part 821, the second neck part 822, the second head part 823, and the third inner circumferential surface 716c. do.

The second elastic body 825 may be provided in any form capable of storing elastic force by deformation of the shape, returning to its original shape, and applying the elastic force to other members. In one embodiment, the second elastic body 825 may be provided as a rubber ring member.

(3) Description of the back pressure seal member 830 according to the third embodiment

Referring to FIG. 7, the back pressure seal member 830 according to the illustrated embodiment includes a third body part 831, a third neck part 832, a third head part 833, a third space part 834, A third elastic member 835 and a third elastic body 836 are included.

Compared with the back pressure seal member 810 according to the above-described first exemplary embodiment, the back pressure seal member 830 according to the present exemplary embodiment is different in that it further includes a third elastic body 836.

In addition, the third body portion 831, the third neck portion 832, the third head portion 833, the third space portion 834, and the third elastic member 835 is the first body portion 811, 1 The neck portion 812, the first head portion 813, the first space portion 814, and the first elastic member 815 have the same material, structure, and function.

In addition, the third elastic body 836 has the same material, structure, and function as the second elastic body 825 provided in the back pressure seal member 820 according to the second embodiment described above. Accordingly, redundant descriptions will be omitted below and will be described focusing on the effect of the back pressure seal member 830 according to the present embodiment.

In this embodiment, as the orbiting scroll 710 rotates, the third body portion 831, the third neck portion 832, and the third head portion 833 itself may be elastically deformed. Furthermore, the third elastic member 835 and the third elastic body 836 may also be elastically deformed, respectively.

Accordingly, a greater elastic force may be applied to the orbiting scroll 710 compared to the first and second embodiments described above. Accordingly, the orbiting movement of the orbiting scroll 710 and movement in the axial direction may be performed more stably.

(4) Description of the back pressure seal member 840 according to the fourth embodiment

Referring to FIG. 8, the back pressure seal member 840 according to the illustrated embodiment includes a fourth body 841, a fourth inclined portion 842, a fourth inner space 843, and a fourth outer space ( 844).

Compared with the back pressure seal member 810 according to the first exemplary embodiment described above, the back pressure seal member 840 according to the present exemplary embodiment has a fourth inclined portion instead of the first neck portion 812 and the first head portion 813. 842) is included.

In addition, instead of the first space portion 814 formed in the back pressure seal member 810 according to the first embodiment described above, the back pressure seal member 840 according to the present embodiment includes the fourth inner space portion 843 and the first space. There is a difference in that it includes the 4 outer space part 844.

The first body portion 811 has the same material, structure, and function as the first body portion 811. Accordingly, hereinafter, the fourth inclined portion 842, the fourth inner space portion 843, and the fourth outer space portion 844 will be described.

The fourth inclined portion 842 is located at one end of the fourth body portion 841 and on the upper side in the illustrated embodiment. The fourth inclined portion 842 is formed to extend and form a predetermined angle with the fourth body portion 841. In one embodiment, the fourth inclined portion 842 may be formed to extend at an angle of 45'.

The fourth inclined portion 842 may be elastically deformed according to the orbiting movement of the orbiting scroll 710 and movement in the axial direction together with the fourth body portion 841. Thereby, the orbiting movement and the axial movement of the orbiting scroll 710 can be stably performed.

A fourth inner space portion 843 is formed inside the fourth inclined portion 842, that is, at one side facing the third inner peripheral surface 716c. In addition, a fourth outer space portion 844 is formed outside the fourth inclined portion 842, that is, at one side facing the first inner peripheral surface 716a.

The fourth inner space 843 and the fourth outer space 844 are configured to compensate for the shape deformation of the back pressure seal member 840 generated as the orbiting scroll 710 is pivoted or moved in the axial direction.

That is, any one or more shape deformations of the fourth body portion 841 and the fourth inclined portion 842 by centrifugal force or elastic force may be accommodated in the fourth inner space 843 and the fourth outer space 844. I can.

Specifically, the fourth body portion 841 may be transformed in shape in a direction toward the second inner circumferential surface 716b and the third inner circumferential surface 716c. The shape deformation of the fourth body portion 841 may be compensated for by the fourth inner space portion 843.

In addition, the fourth inclined portion 842 may be deformed in a direction toward the first inner peripheral surface 716a and the second inner peripheral surface 716b. The shape deformation of the fourth inclined portion 842 may be compensated for by the fourth outer space portion 844.

Accordingly, even if the shape of the back pressure seal member 840 is deformed by centrifugal force or elastic force, it may not be discharged to the outside of the back pressure seal insertion portion 716. In addition, damage to the back pressure seal member 840 and the back pressure seal insertion portion 716 may be prevented.

(5) Description of the effect of the back pressure seal unit 800 according to each embodiment of the present invention

The back pressure seal unit 800 according to the above-described embodiments may be elastically reproduced by centrifugal force generated by the orbiting scroll 710 rotating. Thereby, the back pressure seal insertion part 716 and the back pressure chamber S2 can be effectively sealed.

Accordingly, the refrigerant flowing into the back pressure chamber S2 is not randomly leaked to the outside. As a result, the back pressure formed by the refrigerant in the back pressure chamber S2 can be stably maintained at a pressure greater than or equal to a predetermined level.

In the case of an electric compressor according to the prior art, an O-ring is generally provided on the upper side of the back pressure seal, that is, on one side facing the fixed scroll. In the case of the O-ring, it is difficult to contact so as to cover the back pressure seal, and it is difficult to stably seat on the back pressure seal. When the orbiting scroll is rotated, it is common to damage the O-ring or the back pressure seal due to an unstable contact state between the O-ring and the back pressure seal.

On the other hand, elastic members 815 and 835 may be provided in the back pressure seal unit 800 according to some embodiments of the present invention. In this case, the elastic members 815 and 835 may be provided as leaf springs. Since the leaf spring is configured to cover the head portions 813 and 833, less damage may occur than when provided with an O-ring.

Elastic bodies 825 and 836 may be provided in the back pressure seal unit 800 according to some embodiments. The elastic bodies 825 and 836 are not positioned above the back pressure seal members 820 and 830 and are accommodated in the space portions 824 and 834 formed inside the back pressure seal members 820 and 830.

That is, even when the elastic bodies 825 and 836 are provided as O-rings, the inner wall of the back pressure seal insertion portion 716 and the elastic bodies 825 and 836 do not directly contact. Accordingly, damage due to friction between the elastic bodies 825 and 836 and the inner wall of the back pressure seal insertion portion 716 can be prevented.

At the same time, the elastic bodies 825 and 836 are configured to be deformed in shape together with the back pressure seal members 820 and 830 to store the elastic force and provide them to the orbiting scroll 710. Therefore, not only the back pressure chamber S2 is stably sealed, but the orbiting scroll 710 can be stably moved in the axial direction.

Although the above has been described with reference to preferred embodiments of the present invention, those of ordinary skill in the art will variously modify and change the present invention without departing from the spirit and scope of the present invention described in the following claims. You will understand that you can.

10: electric compressor
100: main housing
110: motor room
120: intake port
200: rear housing
210: exhaust flow path
212: exhaust port
220: oil flow path
300: inverter unit
310: inverter housing
320: inverter cover
330: connector module
332: communication connector
334: power connector
340: printed circuit board
350: inverter device
400: motor unit
410: stator
420: rotor
500: rotating shaft part
510: first end
512: first bearing
520: second end
522: second bearing
530: eccentric
540: rotation pin member
600: frame part
610: frame body
620: main bearing seat
630: main bearing
640: pin member
650: ring member
700: compression unit
710: orbiting scroll
711: turning hard plate
712: turning wrap
713: refrigerant opening
714: second bearing coupling portion
715: ring member coupling portion
716: back pressure seal insert
716a: first inner surface
716b: 2nd inner peripheral surface
716c: 3rd inner periphery
720: fixed scroll
721: fixed hard plate part
722: fixed wrap
723: discharge valve
724: discharge port
800: back pressure seal portion
810: back pressure seal member according to the first embodiment
811: first body portion
812: first neck portion
813: first head portion
814: first space portion
815: first elastic member
820: Back pressure seal member according to the second embodiment
821: second body portion
822: second neck portion
823: second head portion
824: second space part
825: second elastic body
830: Back pressure seal member according to the third embodiment
831: third body portion
832: third neck part
833: third head portion
834: third space part
835: third elastic member
836: third elastic body
840: back pressure seal member according to the fourth embodiment
841: fourth body portion
842: fourth slope
843: fourth inner space portion
844: fourth outer space portion
1000: Orbiting scroll of an electric compressor according to the prior art
1100: Back pressure seal insert according to the prior art
1110: inner wall according to the prior art
1200: Back pressure seal according to the prior art
1300: upper O-ring according to the prior art
S1: inverter room
S2: Back pressure chamber
S3: discharge chamber

Claims (10)

Fixed scroll;
An orbiting scroll positioned adjacent to the fixed scroll and configured to compress a refrigerant by orbiting with respect to the fixed scroll; And
The orbiting scroll includes a frame portion coupled to enable orbital movement,
The orbiting scroll and the frame portion are coupled to form a predetermined space therebetween,
A back pressure seal member configured to seal the predetermined space is inserted into the orbiting scroll,
An elastic member is provided on one side of the back pressure seal member facing the fixed scroll, and is configured to compensate for movement of the back pressure seal member in a direction toward the fixed scroll,
Electric compressor. The method of claim 1,
On one side of the orbiting scroll facing the frame portion, a back pressure seal insertion portion is disposed that is recessed by a predetermined distance and configured to insert the back pressure seal member,
Electric compressor. The method of claim 1,
The back pressure seal member,
A body portion extending in the longitudinal direction;
A neck portion extending at a predetermined angle with the body portion at one end of the body portion facing the fixed scroll and having a thickness smaller than that of the body portion; And
It includes a head portion extending from the end of the neck portion to form a predetermined angle with the neck portion, the elastic member is positioned adjacent to one side facing the fixed scroll,
Electric compressor. The method of claim 3,
The back pressure seal member,
Including a space formed surrounded by the body portion, the neck portion and the head portion,
Electric compressor. The method of claim 4,
The space portion is provided with an elastic body, configured to compensate for movement of the body portion and the neck portion in a direction toward the fixed scroll and a direction away from the fixed scroll,
Electric compressor. Fixed scroll;
An orbiting scroll positioned adjacent to the fixed scroll and configured to compress a refrigerant by orbiting with respect to the fixed scroll; And
The orbiting scroll includes a frame portion coupled to enable orbital movement,
The orbiting scroll and the frame portion are coupled to form a predetermined space therebetween,
A back pressure seal member configured to seal the predetermined space is inserted into the orbiting scroll,
A space portion is formed in the back pressure seal member, and is configured to compensate for movement of the back pressure seal member in a direction toward the fixed scroll and a direction away from the fixed scroll,
Electric compressor. The method of claim 6,
The space portion is provided with an elastic body, configured to compensate for movement of the back pressure seal member in a direction toward the fixed scroll and a direction away from the fixed scroll,
Electric compressor. The method of claim 7,
The back pressure seal member,
A body portion extending in the longitudinal direction;
A neck portion extending at a predetermined angle with the body portion at one end of the body portion facing the fixed scroll and having a thickness smaller than that of the body portion; And
It includes a head portion extending at a predetermined angle with the neck portion at the end of the neck portion,
The space part,
It is formed surrounded by the body portion, the neck portion and the head portion,
Electric compressor. Fixed scroll;
A orbiting scroll positioned adjacent to the fixed scroll and configured to compress a refrigerant by orbiting with respect to the fixed scroll; And
The orbiting scroll includes a frame portion coupled to enable orbital movement,
The orbiting scroll and the frame portion are coupled to form a predetermined space therebetween,
A back pressure seal member configured to seal the predetermined space is inserted into the orbiting scroll,
The back pressure seal member,
A body portion extending in the longitudinal direction; And
An inclined portion extending at a predetermined angle with the body portion at one end of the body portion facing the fixed scroll and having a thickness smaller than that of the body portion,
Electric compressor. The method of claim 9,
The back pressure seal member,
Including an inner space formed surrounded by the body portion and the inclined portion,
Electric compressor.

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